Request a notification when it is a good time start drawing a new
frame, by creating a frame callback. This is useful for throttling
redrawing operations, and driving animations.
When a client is animating on a wl_surface, it can use the 'frame'
request to get notified when it is a good time to draw and commit the
next frame of animation. If the client commits an update earlier than
that, it is likely that some updates will not make it to the display,
and the client is wasting resources by drawing too often.
The frame request will take effect on the next wl_surface.commit.
The notification will only be posted for one frame unless
requested again. For a wl_surface, the notifications are posted in
the order the frame requests were committed.
The server must send the notifications so that a client
will not send excessive updates, while still allowing
the highest possible update rate for clients that wait for the reply
before drawing again. The server should give some time for the client
to draw and commit after sending the frame callback events to let them
hit the next output refresh.
A server should avoid signalling the frame callbacks if the
surface is not visible in any way, e.g. the surface is off-screen,
or completely obscured by other opaque surfaces.
The object returned by this request will be destroyed by the
compositor after the callback is fired and as such the client must not
attempt to use it after that point.
The callback_data passed in the callback is the current time, in
milliseconds, with an undefined base.
request a frame throttling hint
Request a notification when it is a good time start drawing a new frame, by creating a frame callback. This is useful for throttling redrawing operations, and driving animations.
When a client is animating on a wl_surface, it can use the 'frame' request to get notified when it is a good time to draw and commit the next frame of animation. If the client commits an update earlier than that, it is likely that some updates will not make it to the display, and the client is wasting resources by drawing too often.
The frame request will take effect on the next wl_surface.commit. The notification will only be posted for one frame unless requested again. For a wl_surface, the notifications are posted in the order the frame requests were committed.
The server must send the notifications so that a client will not send excessive updates, while still allowing the highest possible update rate for clients that wait for the reply before drawing again. The server should give some time for the client to draw and commit after sending the frame callback events to let them hit the next output refresh.
A server should avoid signalling the frame callbacks if the surface is not visible in any way, e.g. the surface is off-screen, or completely obscured by other opaque surfaces.
The object returned by this request will be destroyed by the compositor after the callback is fired and as such the client must not attempt to use it after that point.
The callback_data passed in the callback is the current time, in milliseconds, with an undefined base.